Merge branch 'dev' of https://github.com/dcloudio/uni-app into dev-mp-welink

packages/uni-cli-shared/components/navigation-bar.vue

@@ -83,7 +83,8 @@ export default {
     }
   },
   created () {
-    const page = getCurrentPages()[0]
+    let pages = getCurrentPages()
+    let page = pages[pages.length - 1]
     this.$watch('title', () => {
       this.setNavigationBarTitle()
     })

src/core/view/components/canvas/index.vue

@@ -446,9 +446,10 @@ export default {
         }, this.$page.id)
         return
       }
-      if (!callbackId) {
+      if (!callbackId) {
+        // fix [...]展开TypedArray在低版本手机报错的问题，使用Array.prototype.slice
         return {
-          data: [...imgData.data],
+          data: Array.prototype.slice.call(imgData.data),
           width: destWidth,
           height: destHeight
         }

src/platforms/app-plus/service/api/ad/rewarded-video-ad.js

@@ -36,7 +36,7 @@ class RewardedVideoAd {
       this._loadAd()
       this._dispatchEvent('close', { isEnded: e.isEnded })
     })
-    rewardAd.onVerify((e) => {
+    rewardAd.onVerify && rewardAd.onVerify((e) => {
       this._dispatchEvent('verify', { isValid: e.isValid })
     })
     rewardAd.onError((e) => {